DXMessageBoxService Class
Allows you to display message boxes.
Namespace: DevExpress.Xpf.Core
Assembly:
DevExpress.Xpf.Core.v19.2.dll
Declaration
[TargetType(typeof(Window))]
[TargetType(typeof(UserControl))]
public class DXMessageBoxService :
ServiceBase,
IMessageBoxService
<TargetType(GetType(Window))>
<TargetType(GetType(UserControl))>
Public Class DXMessageBoxService
Inherits ServiceBase
Implements IMessageBoxService
See Services for more information.
Examples
The following code defines a command within a View Model that displays a message box via a dedicated Message Box service. The service is accessed via the IServiceContainer.GetService<T> method invoked on the View Model's ServiceContainer protected property.
The GetService method retrieves an actual service from a View that implements the specified IMessageBoxService interface. In our example, the method will retrieve a DXMessageBoxService object defined within the View.
Services from a View can be retrieved by a ViewModel if the following conditions are met:
- An actual service object (in this case, the DXMessageBoxService object) is added within a View to the Interaction.Behaviors collection.
- The View's DataContext is set to your View Model.
using System;
using System.Windows.Input;
using DevExpress.Xpf.Mvvm;
public class ViewModel1 : ViewModelBase {
//...
ICommand showAboutCommand;
public ICommand ShowAboutCommand {
get {
if (showAboutCommand == null) {
showAboutCommand = new DelegateCommand<object>(o => {
ServiceContainer.GetService<IMessageBoxService>().Show("About Window");
});
}
return showAboutCommand;
}
}
}
Imports System.Windows.Input
Imports DevExpress.Xpf.Mvvm
Public Class ViewModel1
Inherits ViewModelBase
'...
Private m_showAboutCommand As ICommand
Public ReadOnly Property ShowAboutCommand() As ICommand
Get
If m_showAboutCommand Is Nothing Then
m_showAboutCommand = New DelegateCommand(Of Object)(
Sub(o)
ServiceContainer.GetService(Of IMessageBoxService)().Show("About Window")
End Sub)
End If
Return m_showAboutCommand
End Get
End Property
End Class
<dxcore:DXWindow x:Class="Application1.MainWindow"
. . .
xmlns:dxcore="http://schemas.devexpress.com/winfx/2008/xaml/core"
xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
DataContext="{DynamicResource ViewModel}">
<Window.Resources>
<local:ViewModel1 x:Key="ViewModel"/>
</Window.Resources>
<dxmvvm:Interaction.Behaviors>
<dx:DXMessageBoxService/>
. . .
</dxmvvm:Interaction.Behaviors>
</dxcore:DXWindow>
See Also